MATERIAL CHARACTERIZATION OF HIGH DENSITY CONCRETE USING DIFFERENT ANALYTICAL TECHNIQUES TO SUPPORT LICENCING REQUIREMENTS FOR A CLASS II RADIATION FACILITY
37th Annual CNS-CNA Student Conference - 2013 June 11


Presented at:
37th Annual CNS-CNA Student Conference
2013 June 11
Location:
Toronto, Canada
Session Title:
Student Conference Session

Authors:
Aakash Joshi (UOIT)
Sharman Perera (UOIT)
Edward Waller (UOIT)
Jennie Eastcott (UOIT)
Anthony Waker (UOIT)
Rachid Machrafi (UOIT)
  

Abstract

As a part of the commissioning process for a class II irradiation facility at the University of Ontario Institute of Technology (UOIT), it is required to provide the elemental composition of the construction materials (high density concrete) used for the purpose to shield ionizing radiation to the Canadian Nuclear Safety Commission (CNSC) with reference to the RD/GD-289 regulatory document. Elemental composition of the shielding material was calculated using different analytical techniques such as scanning electron microscopy- energy dispersive spectroscopy (SEM-EDS), x-ray fluorescence (XRF) spectroscopy, inductively coupled plasma- atomic emission spectroscopy (ICP-AES), and thermogravimetric analysis (TGA). The inner walls of the facility was constructed with high density (HD) poured concrete with a density of 4.0 g/cc and was calculated to have an elemental composition of 58.9% iron (Fe), 4.4% silicon (Si), 0.4% titanium (Ti), 4.42% calcium (Ca), 0.468% magnesium (Mg), 0.442% aluminum (Al), 0.215% potassium (K), 0.022% manganese (Mn), 0.087% phosphorus (P), and 33.285% oxygen and hydrogen (O-H). The calculated composition was compared against the composition of the interlocking bricks and was found to be within ±2.5% of the manufacturerÕs composition data. Not one single technique alone can be used to obtain the complete composition of the high density concrete due to the sensitivity of the analytical techniques for different elements. SEM-EDS was used efficiently to analyze for relatively insoluble elements such as Fe, Si and Ti, while ICP-AES was used to accurately analyze for relatively soluble elements such as Ca, Mg, Al, K, Mn, and P. TGA was used to characterize the quantity of oxygen within unbound water; while SEM-EDS relatively quantified bound oxygen (oxides).

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